code: def fork(self) -> dict[str, RngStream]:
      ...
  
imports: from __future__ import annotations
  import dataclasses
  import hashlib
  import typing
  import jax
  import numpy
  from flax.experimental.nnx.nnx import errors, filterlib, tracers
label_desc: Use image node_id 12 for calling the Rngs obj's underlying member method code with example usage: obj.fork() without return types